高岭土和蒙脱土存在下nC₆₀纳米颗粒稳定性研究

The sedimentation tests for nC₆₀ in the presence of kaolinite and montmorillonite with different mass concentration ratios were conducted and fitted with two sedimentation models. Meanwhile, the particle zeta potential and size analysis as well as SEM and TEM tests were implemented to examine the stability of the particles. It has been observed that nC₆₀ was stable in the single system. The stability of kaolinite particles significantly decreased with increasing concentration in the single system, however, the montmorillonite particles was overall stable and it was independent of its concentration. In the binary system, the stability of nC₆₀ decreased significantly with the increase of kaolinite concentration. The stability of nC₆₀, however, was basically not affected by montmorillonite and had no relation to the montmorillonite concentration. The result of this study showed that the clay minerals played a role in the stability of nC₆₀ and the difference in the structure and specific surface area of kaolinite and montmorillonite was probably the reason for their different effects on nC₆₀ stability. The two different sedimentation models showed that semi-empirical model was better to simulate the sedimentation process related to montmorillonite particles, while the theoretical sedimentation model showed better fitting results associated with kaolinite colloids and kaolinite/nC₆₀ mixtures. This study can serve as a reference to assess the contamination of nC₆₀ on groundwater.